Rich McKinsie of Superchips responded his device will do 3.73 and 4.10, but not our 3.91. I followed up with the fact that as this ratio becomes more and more popular, he should consider making this a selectable option and implement it through a version update so it is available across the board to even current owners. Rich said that "would require finding one in our area that is factory stock with that gear option for testing in order to make a program for it."